stable 555 driver

[ahura999]

dont know about anyone else but hae been down the track of sourcing and building various 555 drier circuits, this is the one ive found best .


ahura



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[EgmQC]

dont know about anyone else but hae been down the track of sourcing and building various 555 drier circuits, this is the one ive found best .


ahura



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The main problem with the 555 is , each time you change the duty cycle , you affect the frequency.If you want something that is by 100 time more usefull than a 555, use a TL494CN , voltage controled . Cost 0.79$ so its realy cheap.

Best Regards,
EgmQC

[Matthew Jones]

If you want something that is by 100 time more useful than a 555, use a TL494CN

Do you know where to find some examples of a circuit that uses it? I have no electronic skills.

Matt

[EgmQC]

Do you know where to find some examples of a circuit that uses it? I have no electronic skills.

Matt

Middle of that page.

The MEG Project gateway

Best Regards,
EgmQC

[blackchisel97]

Tl494

AC/DC and DC/DC Power Supplies - PWM Power Supply Controllers - TL494 - TI.com

TL494 datasheet, Pinout ,application circuits PWM Control Circuit

There is also SG3524, used in John Bedini Patent -Pulse Charging Battery and Driving Other Devices with Pulse, from 2003.


Vtech

[ahura999]

The main problem with the 555 is , each time you change the duty cycle , you affect the frequency.If you want something that is by 100 time more usefull than a 555, use a TL494CN , voltage controled . Cost 0.79$ so its realy cheap.

Best Regards,
EgmQC

like i said "555 driver" there are other chips/config available.

[ahura999]

Middle of that page.

The MEG Project gateway

Best Regards,
EgmQC

mmmmmmmm, the MEG , not even going to go there ! TL494CN different story !

[gyula]

The main problem with the 555 is , each time you change the duty cycle , you affect the frequency.If you want something that is by 100 time more usefull than a 555, use a TL494CN , voltage controled . Cost 0.79$ so its realy cheap.

Best Regards,
EgmQC

Yes, most of the applications shown in the web include 555 circuits that shift their frequencies when duty cycle is changed.
I have already referred to a link and also showed a 555 circuit in which the two variables do not "see" each other after their any adjustment, see here:
http://www.energeticforum.com/renewa...html#post61324

Yes, a TL494 is also a good solution. Using a CMOS version of the 555 gives a very little input power consumption for its own operation, this may be a benefit in certain circumstances and also it has a 2-3MHz upper frequency limit versus the some hundred kHz of the bipolar timer versions.

rgds, Gyula